\begin{tikzpicture}
	\tkzDefPoints{0/0/B, 5/0/C, 0/2.5/D, 3/2.5/A, 5/2.5/E}

	\tkzDrawPolygon(A,B,C)
	\tkzDrawSegment(D,E)
	\tkzLabelPoints[above](A)
	\tkzLabelPoints[below](B,C,D,E)
\end{tikzpicture}

